Free Tax Tools

Free Australian tax calculators: GST, home office, cents per km, BAS quarterly, instant asset write-off, and sole trader income tax — all updated for FY2025-26.

BAS Calculator Quarterly Australia

Calculate your quarterly BAS instantly. Enter sales and purchases, see GST payable, optional PAYG instalments, and total amount due to the ATO.

Cents Per KM Calculator Australia

Calculate your work-related car deduction using the ATO's cents per km method. 88c/km for FY2025-26, capped at 5,000 business km per car.

Instant Asset Write-Off Calculator Australia

Check if your asset qualifies for the $20,000 instant asset write-off in 2025-26. Eligibility test for turnover, asset cost, and installation deadline.

Sole Trader Tax Calculator Australia

Estimate your sole trader tax for FY2025-26. Income tax, Medicare Levy, LITO offset, and take-home pay — based on Stage 3 brackets.

GST Calculator Australia

Free GST calculator for Australian businesses. Instantly add or remove 10% GST from any amount. Calculate GST-inclusive and GST-exclusive prices.

Home Office Deduction Calculator Australia

Calculate your home office tax deduction in Australia. Compare the fixed rate method (67c/hour) vs actual cost method and see which gives a bigger claim.

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